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3.5 Ions

Looking back at Table 3 indicates that all atoms have equal number of protons (positively charged) and electrons (negatively charged) as a result of which the net charge in the atom is 0.

But when any atom gains or loses one or more electrons we get atoms with imbalance charge which are termed as ions. Ions can be positively charged (loses electron) or negatively charged (gains electron).

Different charge states for Iron is

Fe0 - neutral

Fe+2 - Ferrous ion (loses 2 electrons)

Fe+3 - Ferric ion (loses 3 electrons)

 

The atomic charge of various elements influences its chemical behavior. This is clearly depicted in the periodic table. Elements of the same group have the same charge on their ions.


Class

Position

Charge

Examples

Alkali metals

Group IA

+1

Nað++, K+ð+, Cs+ð+

Alkaline earth metals

Group IIA

+2

Mg2+ð+, Ca2+ð+, Sr2ð++

Halogens

Group VIIA

1

F-, Cl-, Br-, I-

Noble gases

Group O

-

He, Ne, Ar

[next page]

Index

3.1 The Atom
3.2 Isotopes
3.3 Atomic Weight
3.4 Radioactivity
3.5 Icons
3.6 Orbital
Chapter 4





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